One function of filter plates is to increase the effectiveness of the filter chamber walls, thereby expanding the surface area of the filter cloth attached to the plates. In the initial design of a pressure filter, to accommodate the purpose of filtration, the most direct method to achieve this is to increase the surface area of the filter cloth within the pressure filter. Since the filter cloth depends on the filter plate walls, it becomes necessary to expand the area of the filter chamber walls within the limited space. The filter chamber of a pressure filter is composed of individual filter plates, with each plate's area equivalent to the surface area of the filter chamber wall. Each plate can also have a corresponding filter cloth surface area, allowing the effective filtration area of the pressure filter to be increased several times over, as long as it remains within the pressure and load-bearing capacity. This is the crucial role of filter plates in pressure filters, and the reason why filter plates are an indispensable component of all pressure filter equipment.
Another function of the filter plate is to create a storage space for the filter cake. The filter plates of a pressure filter are initially designed with an inward concave shape. This design allows for space to hold the volume of the filter cake as it is intercepted by the filter cloth. The blind spot at the bottom is also designed to increase friction on the filter cake, providing greater support. Thus, the filter plate serves as a storage and support for the filter cake.
In summary, filter cloth in pressure filters plays a crucial role in establishing storage space for filter cake and increasing the filter wall area, which is a necessary condition for the application of pressure filters in today's high-speed industrial production.